*
   * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated; use {@link
   * Math#addExact(long, long)} instead. Note that if both arguments are {@code int} values, writing
   * {@code Math.addExact(a, b)} will call the {@link Math#addExact(int, int)} overload, not {@link
   * Math#addExact(long, long)}. Also note that adding two {@code int} values can <b>never</b>

The query parameter `q` is of type `str | None`, that means that it's of type `str` but could also be `None`, and indeed, the default value is `None`, so FastAPI will know it's not required.

/// note

FastAPI will know that the value of `q` is not required because of the default value `= None`.

Having `str | None` will allow your editor to give you better support and detect errors.

///

   * href="http://tools.ietf.org/html/rfc4291#section-2.5.5.1">RFC 4291</a>.
   *
   * <p>NOTE: This method is different from {@link Inet6Address#isIPv4CompatibleAddress} in that it
   * more correctly classifies {@code "::"} and {@code "::1"} as proper IPv6 addresses (which they
   * are), NOT IPv4 compatible addresses (which they are generally NOT considered to be).
   *

```Python
q: Union[str, None] = None
```

И для Python 3.10 и выше:

```Python
q: str | None = Query(default=None)
```

...делает параметр необязательным со значением по умолчанию `None`, также как это делает:

```Python
q: str | None = None
```

Но он явно объявляет его как query-параметр.

/// info | Дополнительная информация

Da einfache Werte standardmäßig als Query-Parameter interpretiert werden, müssen Sie `Query` nicht explizit hinzufügen, Sie können einfach schreiben:

```Python
q: Union[str, None] = None
```

Oder in Python 3.10 und darüber:

```Python
q: str | None = None
```

Zum Beispiel:

{* ../../docs_src/body_multiple_params/tutorial004_an_py310.py hl[27] *}

/// info

As, by default, singular values are interpreted as query parameters, you don't have to explicitly add a `Query`, you can just do:

```Python
q: Union[str, None] = None
```

Or in Python 3.10 and above:

```Python
q: str | None = None
```

For example:

{* ../../docs_src/body_multiple_params/tutorial004_an_py310.py hl[28] *}


/// info

* ⚫️ ✊ 🔠 **📨** 👈 👟 👆 🈸.
* ⚫️ 💪 ⤴️ 🕳 👈 **📨** ⚖️ 🏃 🙆 💪 📟.
* ⤴️ ⚫️ 🚶‍♀️ **📨** 🛠️ 🎂 🈸 ( *➡ 🛠️*).
* ⚫️ ⤴️ ✊ **📨** 🏗 🈸 ( *➡ 🛠️*).
* ⚫️ 💪 🕳 👈 **📨** ⚖️ 🏃 🙆 💪 📟.
* ⤴️ ⚫️ 📨 **📨**.

/// note | 📡 ℹ

🚥 👆 ✔️ 🔗 ⏮️ `yield`, 🚪 📟 🔜 🏃 *⏮️* 🛠️.

🚥 📤 🙆 🖥 📋 (📄 ⏪), 👫 🔜 🏃 *⏮️* 🌐 🛠️.

///

## ✍ 🛠️

✍ 🛠️ 👆 ⚙️ 👨‍🎨 `@app.middleware("http")` 🔛 🔝 🔢.

🛠️ 🔢 📨:

     * Note that the artifact need not actually exist yet at the returned location,
     * the path merely indicates where the artifact would eventually be stored.
     *
     * @param session The session to use, must not be {@code null}.
     * @param local The local repository, must not be {@code null}.
     * @param artifact The artifact for which to determine the path, must not be {@code null}.

O `directory="static"` refere-se ao nome do diretório que contém seus arquivos estáticos.

O `name="static"` dá a ela um nome que pode ser usado internamente pelo FastAPI.

* Получает **ответ** (от *операции пути*).
* Может что-то сделать с этим **ответом** или выполнить любой нужный код.
* И возвращает **ответ**.

/// note | Технические детали

Если у вас есть зависимости с `yield`, то код выхода (код после `yield`) будет выполняться *после* middleware.